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Hi, New to the forum and hope you can help. 2014 Fusion Hybrid SE. I am having intermittent failures of the backup warning system. The "check rear park aide" warning message comes on to check the backup sensor. When this does, it usually results in the backup sensors not working. This had gone on intermittently for about two months and we had the car in for the first annual service and they checked it with no faults recorded and could not find any problems. Two days after the service, it started doing the same thing on and off for about a week. I was able to capture it on a vehicle health report and the next day I was driving it and the message came on again. I immediatley took it to Cowles Ford and they were nice enough to have a mechanic capture the error code while the car was still running and showing the warning. They captured the error code which indicated a failed rear sensor. We took it back about a week later and they replaced the sensor. The next day my wife was driving it and the same warning came on. She used the car multiple times and the warning came and went. Sometimes it would come on when driving and go out, sometimes it would come on and stay on until the next start of the car. We brought it back to Cowles and they are "looking at it" to find out what is wrong. They just sent an email saying that they could not replicate the problem and could not find anything wrong with the system. There are no patterns which I could discern as to when it failed. Frustration with this. Are there any technical bulletins or notices out on this problem? The car is still under warranty and I want to get it fixed before it expires. HELP!